Was that the same wife who lost her 710?
She walked into the spares shop and asked the bloke behind the counter if he had a 710 to fit her car.
Bloke behind counter scratches his head and asked her what she wanted again..
I need a new 710, because mine seems to have been lost.
Lady, I don't know what you after, can you describe what a 710 looks like?
It's a round thing on the motor, she explains, and it has 710 marked on it.
He scratches his head some more and says.. you'll have to show me where it fits on the car, because I have no idea what you are looking for.
She takes him out to the car, pops the bonnet and points to a round hole on top of the engine.. It used to be right there she says.
OK, yes I think I have one of them to fit your car... he goes in and returns with a screw cap marked OIL.....

OIL 710 OIL......